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Finding the Fourth Proportional to 53,905.20, 80,819.40 and 20,612.40

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Solution

The fourth proportional to 53,905.20, 80,819.40 and 20,612.40 is: 30,903.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    53,905.20 : 80,819.40 = 20,612.40 : x
  2. Step 2: Convert to fraction form
    53,905.20/80,819.40 = 20,612.40/x
  3. Step 3: Cross multiply
    53,905.20x = 80,819.40 × 20,612.40
  4. Step 4: Simplify right side
    53,905.20x = 1,665,881,800.56
  5. Step 5: Solve for x
    x = 1,665,881,800.56/53,905.20
  6. Step 6: Final answer
    x = 30,903.92

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.